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+# Executing syzkaller programs
+
+This page describes how to execute existing syzkaller programs for the purpose of bug reproduction. This way you can replay a single program or a whole execution log with several programs.
+
+1. Setup Go toolchain (if you don't yet have it, you need version 1.8 or higher):
+Download latest Go distribution from (https://golang.org/dl/). Unpack it to `$HOME/go1.8`.
+``` bash
+$ export GOROOT=$HOME/go1.8
+$ export GOPATH=$HOME/gopath
+```
+
+2. Download syzkaller sources:
+``` bash
+$ go get -u -d github.com/google/syzkaller/...
+```
+
+3. Build necessary syzkaller binaries:
+``` bash
+$ cd $GOPATH/src/github.com/google/syzkaller
+$ make
+```
+
+4. Copy binaries and the program to test machine:
+``` bash
+$ scp bin/syz-execprog bin/syz-executor program test@machine
+```
+
+5. Run the program on the test machine:
+``` bash
+$ ./syz-execprog -executor ./syz-executor -cover=0 -repeat=0 -procs=16 program
+```
+
+Several useful `syz-execprog` flags:
+```
+  -collide
+    	collide syscalls to provoke data races (default true)
+  -procs int
+    	number of parallel processes to execute programs (default 1)
+  -repeat int
+    	repeat execution that many times (0 for infinite loop) (default 1)
+  -sandbox string
+    	sandbox for fuzzing (none/setuid/namespace) (default "setuid")
+  -threaded
+    	use threaded mode in executor (default true)
+```
+
+If you pass `-threaded=0 -collide=0`, programs will be executed as a simple single-threaded sequence of syscalls. `-threaded=1` forces execution of each syscall in a separate thread, so that execution can proceed over blocking syscalls. `-collide=0` forces second round of execution of syscalls when pairs of syscalls are executed concurrently.